userdata.dll and logonui.exe

I am running a relatively new Windows 7 64-bit computer. For no apparent reason I've begun getting logonui.exe errors that claim there's a missing userdata.dll file. This occurs whenever I shut down and boot up the computer. The shut down or boot up processes hang until I acknowledge the message, though once I'm past it there does not appear to be an lingering effect. Where does this message come from, and how can I get rid of it?

Please try to restore at earlier restore point as already suggested by John Hurst above.

If that doesn't work then you need to Repair from Windows Installation CD/DVD to extract logonUI.exe files.
steps are below.

Follow the steps below to properly perform System Repair in Windows 7/Vista:

Restart your PC, Insert the Windows 7/Vista installation CD/DVD into the disk drive
When prompted, press any key to boot from the inserted CD or DVD. Failing to do so will result in your system trying to boot to the operating system currently installed in your hard drive
Choose the “Language to install”, “Time”, and “Keyboard or input method” according to your needs
Click on “Repair your computer” located at the bottom left of your screen, and enter the “System Recovery Options” menu
Choose the operating system you’d like to perform the Startup Repair on and click Next
Locate and click “Startup Repair” from the list of options presented at the System Recovery Options.
Wait for the system to locate for any missing or corrupted files
Once completed, click “Finish” and reboot your PC for the Windows to properly execute the changes made

Please re-register userdata.dll from an elevated command prompt

Click the Start button.
Type "command" in the search box... DO NOT hit ENTER yet!
While holding CTRL-Shift on your keyboard, hit ENTER.
You will be prompted with a permission dialog box.
Click Yes.
Type the following command: regsvr32 /u userdata.dll.
Hit ENTER. This will UN-REGISTER your file.
Type the following command: regsvr32 /i userdata.dll.
Hit ENTER. This will RE-REGISTER your file.
Close the command prompt window.
Re-start the program associated with userdata.dll error.

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@John, thank you so much for your concern however these are just simple steps in a sequence if anyone write it would be in the same manner thats why i did not mention the site i copied. However i will remember

Thanks for posting responses. Here is my problem. First, I can't do a Windows repair, because I don't have the original Windows disk. The operating system came installed on my computer, and when I try to use Lenovo's tools to make a system disk it won't let me because of the userdata.dll problem. Any other ideas? I was able to find the userdata.dll file on my hard drive ... can you tell me where it's supposed to live? Thanks.

Starting isn't a problem. It just requires two clicks of the error message and then normal Windows operates fine (until it's time to shut down, which requires the same process). The link to the Microsoft Scannow command seems to have worked. Thanks a million.

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